Core Vocabulary Official Included By Default

A mandatory vocabulary that defines keywords that are either required in order to process any schema or meta-schema, including those split across multiple documents, or exist to reserve keywords for purposes that require guaranteed interoperability.

Dialect 2019-09
URI https://json-schema.org/draft/2019-09/vocab/core
Specification https://json-schema.org/draft/2019-09/draft-handrews-json-schema-02#rfc.section.8
Authors
Metaschema https://json-schema.org/draft/2019-09/meta/core

This vocabulary is mandatory on this dialect. It is available by default and cannot be removed.

Keywords

Keyword Kind Instance Summary
$schema Identifier Any This keyword is both used as a JSON Schema dialect identifier and as a reference to a JSON Schema which describes the set of valid schemas written for this particular dialect.
$id Identifier Any This keyword declares an identifier for the schema resource.
$ref Applicator Any This keyword is used to reference a statically identified schema.
$defs Reserved Location Any This keyword reserves a location for schema authors to inline re-usable JSON Schemas into a more general schema.
$comment Reserved Location Any This keyword reserves a location for comments from schema authors to readers or maintainers of the schema.
$recursiveAnchor Identifier Any This keyword is used to dynamically identify a base URI at runtime by marking where such a calculation can start, and where it stops.
$recursiveRef Applicator Any This keyword is used to reference an identified schema, deferring the full resolution until runtime, at which point it is resolved each time it is encountered while evaluating an instance.
$anchor Identifier Any This keyword is used to create plain name fragments that are not tied to any particular structural location for referencing purposes, which are taken into consideration for static referencing.
$vocabulary Identifier Any This keyword is used in meta-schemas to identify the required and optional vocabularies available for use in schemas described by that meta-schema.